Question

What is the average velocity of the sulfur trioxide molecules in the gas phase at 25°C?...

What is the average velocity of the sulfur trioxide molecules in the gas phase at 25°C?

a. 9.6 m/s

b. 10.8 m/s

c. 340 m/s

d. 305 m/s

e. 258 m/s

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Homework Answers

Answer #1

root mean square speed = (3RT/M)1/2

where, R = ideal gas constant = 8.3145 (Kg.m2/sec2) / (K.mol)

T = absolute tempreture = 250C = 273.15 + 25 = 298.15 K

M = mass of mole of gas in kilogram = 80.066 gm/mol = 80.066 10-3 kg/mol

Substitute value in above equation

root mean square speed of H2 = [[3 (8.3145 (Kg.m2/sec2) / (K.mol)) (298.15 K)] / [(80.066 10-3 kg/mol)]]1/2

= [92884.676704 m2/s2]1/2

= 304.8 m/s

Answer - d. 305 m/s

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